Details:

Creators:
Parsons, Robert L. ; Foster, Derek H. ; Cross, Stephen A.
Parsons, Robert L. ; Foster, Derek H. ; Cross, Stephen A. Less -
Corporate Contributors:
Kansas. Dept. of Transportation ; University of Kansas
Kansas. Dept. of Transportation ; University of Kansas Less -
Subject/TRT Terms:
[+]
Compacted Earth Fill Compaction Specifications Embankments Field Tests Ground Settlement Highway Embankments Kansas Moisture Content Recommendations Soil Compaction Surveys
Resource Type:
Tech Report
Geographical Coverage:
Kansas
Abstract:
Unanticipated settlement of compacted earth fill has been a continuing problem for embankments managed by Kansas Department of Transportation (KDOT). This report contains the results of an investigation of current compaction specifications, with particular emphasis on the Type B compaction specification that relies on visual verification of compaction by sheepsfoot roller walkout. This investigation consisted of two parts: a field investigation of existing embankments with varying levels of performance and a telephone survey of other DOT's to determine the status of compaction specifications. Eight embankments constructed between 1994 and 2000 were selected for undisturbed field sampling. Two borings were drilled in each embankment and shelby tube samples were collected for testing at regular intervals. Samples of the cuttings were also collected for testing. A telephone survey of all state DOT's was conducted to assess current practice with regard to specifications for compaction of fills. Thirty-two states, including Kansas, responded to the survey. It was determined that a number of compaction and moisture specifications are currently in use, however there were common themes among the specifications. Based on the results of this research it is recommended that KDOT specify a relative compaction standard and a moisture content range based on the optimum moisture content for compaction of embankments. It is recommended that the compaction standard be at least 95 percent of maximum density as determined by KT-12 (AASHTO T 99), or an equivalent relative compaction based on modified effort (AASHTO T 180). It is also recommended that the specified moisture range be centered about optimum or a point slightly above optimum, as the average moisture content of the existing embankments is slightly above optimum. Tables, figures, references, appendices. 936k, 158p.
Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:d8af2bbbf0b54b261968c85d3545ec14f2047d800620b64a7169658c4700c59a
Download URL:
https://rosap.ntl.bts.gov/view/dot/14956/dot_14956_DS1.pdf
File Type:

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